<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Lzf.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Filter_Compress_CompressInterface
 */
require_once 'Zend/Filter/Compress/CompressInterface.php';

/**
 * Compression adapter for Lzf
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_Compress_Lzf implements Zend_Filter_Compress_CompressInterface {
	/**
	 * Class constructor
	 */
	public function __construct() {
		if (! extension_loaded ( 'lzf' )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( 'This filter needs the lzf extension' );
		}
	}
	
	/**
	 * Compresses the given content
	 *
	 * @param  string $content
	 * @return string
	 */
	public function compress($content) {
		$compressed = lzf_compress ( $content );
		if (! $compressed) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( 'Error during compression' );
		}
		
		return $compressed;
	}
	
	/**
	 * Decompresses the given content
	 *
	 * @param  string $content
	 * @return string
	 */
	public function decompress($content) {
		$compressed = lzf_decompress ( $content );
		if (! $compressed) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( 'Error during compression' );
		}
		
		return $compressed;
	}
	
	/**
	 * Returns the adapter name
	 *
	 * @return string
	 */
	public function toString() {
		return 'Lzf';
	}
}
